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db/cu and 521.5.1 Ferromagnetic enclosures: electromagnetic effects

psychicwarrior

a good day wishes to all

 

‘they’ do not write these things for no reason; there is science present, so …

using this example: what's the non-compliance issue, if any in reality, with meter tails entering a db/cu through the same opening (fair enough), but a main earthing conductor being glanded/bolted to the housing inside (via a different aperture to the tails, to the earthbar attached to the case, along with bonding etc),  or even on the outside  ?   

 

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    Chris Pearson: 
     

    I don't think that there is a non-compliance.

    521.5.1: Where such conductors enter a ferrous enclosure …

    If the earthing conductor is bolted to a terminal which has been provided for that purpose on the outside of the enclosure, the cable does not enter the enclosure.

     

    if this all about balancing current entering leaving…

    if it [mec] goes inside to the earth bar (along with bonding etc) via a different knockout panel ?

    and what is the balancing issue, if there is a problem with the above internal earthbar connection, set against bolted/glanded to the case ?

     

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  • 0

    Chris Pearson: 
     

    I don't think that there is a non-compliance.

    521.5.1: Where such conductors enter a ferrous enclosure …

    If the earthing conductor is bolted to a terminal which has been provided for that purpose on the outside of the enclosure, the cable does not enter the enclosure.

     

    if this all about balancing current entering leaving…

    if it [mec] goes inside to the earth bar (along with bonding etc) via a different knockout panel ?

    and what is the balancing issue, if there is a problem with the above internal earthbar connection, set against bolted/glanded to the case ?

     

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